Looking at the desktop guide, I’ve always been surprised about the first two items that appear:
Getting started with GNOME
New to GNOME? Learn how to get around.
Visual overview of GNOME
A visual overview of your desktop, the top bar, and the Activities overview.
In my opinion, the leading help article should be “Getting started with Ubuntu”. People may not know that they’ve installed GNOME. We can teach that, but it shouldn’t come first.